Rhododendron delavayi

Names and Synonyms

Scientific Names

Accepted name

Synonyms

• Rhododendron arboreum subsp. delavayi
• Azalea delavayi

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, falling under the class Equisetopsida and subclass Magnoliidae. Within the order Ericales, it is a member of the family Ericaceae. It is specifically classified under the genus Rhododendron.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a broad geographical distribution spanning several key regions across Asia. In China, it can be found throughout the South-Central and Southeast territories. Additionally, it is native to the high-altitude landscapes of Tibet. Moving into the Indian Subcontinent, the species is documented within the state of Assam. Finally, its range extends across the rugged terrain of the East Himalaya.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Rhododendron delaavayi is defined by its adaptation to high-altitude montane environments, where it occupies a specific vertical niche within its native mountain ecosystems. This species thrives across a broad altitudinal gradient, primarily establishing itself in temperate forest zones and subalpine scrublands. Its distribution is characterized by a minimum elevation of 1200 m AMSL, extending upward through a mean elevation of approximately 2200 m AMSL, and reaching its ecological limits at a maximum altitude of 3400 m AMSL. This wide elevational range suggests a high degree of plasticity, allowing the plant to tolerate varying levels of solar radiation, temperature fluctuations, and soil moisture availability typical of mid-to-high mountain slopes.

Elevational range max:

3400 m AMSL

Elevational range mean:

2200 m AMSL

Elevational range min:

1200 m AMSL

Life history

The life history of Rhododendron delaavayi is characterized by its status as a perennial species, allowing it to establish long-term presence within its native high-altitude habitats. Throughout its life cycle, the plant maintains an evergreen habit, ensuring that its foliage remains functional and persistent across different seasons rather than shedding leaves annually. This combination of a perennial lifecycle and evergreen deciduousness enables the plant to sustain continuous photosynthetic activity and withstand the environmental fluctuations typical of its ecological niche.

Deciduousness :

evergreen

Lifecycle :

perennial

Morphology

The morphology of Rhododendron delaavayi is characterized by a woody growth form that can manifest as both a shrub and a tree. As a self-supporting plant, it lacks climbing tendencies and functions as a terrestrial species rather than an epiphyte. In terms of stature, the plant exhibits significant variability in height, with individual specimens ranging from a minimum of 1 meter to a maximum of 7 meters, while maintaining an average plant height of approximately 4 meters.

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

tree

Growth form :

shrub

Plant height max:

7 m

Plant height mean:

4 m

Plant height min:

1 m

Woodiness :

woody

Physiology

The physiology of Rhododendron delaavayi is characterized by significant morphological variability in its foliar structure, which plays a critical role in its metabolic processes and environmental adaptation. The leaves exhibit a diverse range of dimensions, with mean leaf lengths measuring approximately 11 cm, though individual specimens may fluctuate between a minimum of 7 cm and a maximum of 15 cm. This variation in longitudinal growth is accompanied by a specific width profile, where leaf widths range from a minimum of 1.5 cm to a maximum of 4.5 cm. Such structural parameters influence the plant's photosynthetic surface area and its ability to regulate transpiration and gas exchange within its natural habitat.

Leaf length max:

15 cm

Leaf length mean:

11 cm

Leaf length min:

7 cm

Leaf width max:

4.5 cm

Leaf width min:

1.5 cm

Reproduction

The reproduction of Rhododendron delaayi culminates in the development of characteristic fruit structures that exhibit specific morphological dimensions. The resulting fruits are elongated in shape, with a mean length of 1.9 cm, though they can range from a minimum of 1.8 cm to a maximum of 2 cm. In terms of lateral dimension, the fruit width remains highly consistent, maintaining a mean value of 0.8 cm, which aligns with both its minimum and maximum width measurements of 0.8 cm. These precise measurements of fruit length and width define the reproductive output of the species during its fruiting stage.

Fruit length max:

2 cm

Fruit length mean:

1.9 cm

Fruit length min:

1.8 cm

Fruit width max:

0.8 cm

Sources: Global Inventory of Floras and Traits (GIFT)

Plant Parts

Rhododendron delavayi has 1 reported plant parts identified across 1 scientific publications and several other databases that are studied for medicinal purposes. The most consistently reported plant part include leaf.

Leaf

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Chemicals

Rhododendron delavayi has 4 reported phytochemicals identified across 1 scientific publications and several other databases. The most consistently reported chemicals include 3',4',5,7-Tetrahydroxy-3-methoxyflavone, CATECHIN, Epicatechin, epicatechin-(2beta->O->7,4beta->8)-ent-epicatechin.

3',4',5,7-Tetrahydroxy-3-methoxyflavone

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

CATECHIN

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Epicatechin

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

epicatechin-(2beta->O->7,4beta->8)-ent-epicatechin

1. Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials

Preparations